mod_perl installation problem

Hi,
I'm trying to install mod_perl on sun solaris 5.10 with apache 2.2.9.

after perl Makefile.PL I have this problem

Configuring Apache/2.2.9 mod_perl/2.0.4 Perl/v5.10.1
[  error] Using Perl 5.010001 w/o ithreads and 'worker' mpm httpd.
[  error] Failed requirements:
[  error]   - Perl built with ithreads (build perl with -Dusethreads)

this is the status of  my perl:

-bash-3.00$ perl -V
Summary of my perl5 (revision 5 version 10 subversion 1) configuration:

  Platform:
    osname=solaris, osvers=2.10, archname=i86pc-solaris
    uname='sunos svil-web1 5.10 generic_118855-33 i86pc i386 i86pc '
    config_args='-ds -e -*Dusethreads*'
    hint=previous, useposix=true, d_sigaction=define
    useithreads=undef, usemultiplicity=undef
    useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
    use64bitint=undef, use64bitall=undef, uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='gcc', ccflags ='-fno-strict-aliasing -pipe -D_LARGEFILE_SOURCE
-D_FILE_OFFSET_BITS=64 -DPERL_USE_SAFE_PUTENV -DPERL_USE_SAFE_PUTENV
-DPERL_USE_SAFE_PUTENV -DPERL_USE_SAFE_PUTENV',
    optimize='-O',
    cppflags='-fno-strict-aliasing -pipe -fno-strict-aliasing -pipe
-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -DPERL_USE_SAFE_PUTENV
-DPERL_USE_SAFE_PUTENV'
    ccversion='', gccversion='3.4.3 (csl-sol210-3_4-branch+sol_rpath)',
gccosandvers='solaris2.10'
    intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
    ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t',
lseeksize=8
    alignbytes=4, prototype=define
  Linker and Libraries:
    ld='gcc', ldflags =' '
    libpth=/usr/lib /usr/ccs/lib
    libs=-lsocket -lnsl -ldl -lm -lc
    perllibs=-lsocket -lnsl -ldl -lm -lc
    libc=/lib/libc.so, so=so, useshrplib=false, libperl=libperl.a
    gnulibc_version=''
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags=' '
    cccdlflags='-fPIC', lddlflags='-G'


Why?

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